Brazing is one of the joining method wherein coalescence is produced by heating in a suitable temperature and by additional using a filler metal and having a liquidus temperature above 4270C and bellow the solidus temperature of base metals.
In braze process the metallic parts are joined by a non-
The filler metals are distributed through the closely fitted mating parts and joint by the capillary action force. Brazing is the semi-
Principle of brazing operation:
There are not necessary to melt the base metal. In brazing process comparatively the low melting point filler metals are used against the base metal. The joint operation will be success while the base metal pieces are cleaned and free from oxides, oils, grease etc.
The braze filler metal wets the base metal surfaces and spreads along the consecutive joint surface with the capillary action. Here the capillary action force is plying major part of rolls to producing good quality of brazing joint.
For the brazing process doing smoothly the fluxes are used additionally, which is cleaned the metal surfaces and provided the wet properties to the base metal surface.
Due to the capillary attraction between the base metal and filler metal is much times higher than that between the flux and brazing base metal. In the brazing process the fluxes are thrown away and filler metals are flows into the very tiny gap of mating parts or by the capillary attraction the joint is produced. While the gap of mating parts are too small, the capillary attraction flow will be better.
Remember this— the high fluidity of molten filler metal is the important factor in obtaining successful brazing joint.
How to braze:
In brazing operation following the steps -
Brazing filler metal properties:
Advantages of brazing joints: